Yes, Michael and Kathy, isn't it grand?

From the extensive entry at http://en.wikipedia.org/wiki/Eilean_Donan, somewhat edited for clarity: . . . The castle was built in the thirteenth century, and was a stronghold of the Clan Mackenzie and their allies, Clan Macrae. The Mackenzies' involvement in the Jacobite rebellions led to the castle's destruction by government ships  in 1719. Lieutenant-Colonel John Macrae-Gilstrap's 20th-century reconstruction of the ruins resulted in the present buildings.

During the reign of Alexander II (ruled 1214–1249), a large curtain-wall castle was constructed that enclosed much of the island. The area was then at the boundary of the Norse-Celtic Lordship of the Isles and the Earldom of Ross. Eilean Donan provided a strong defensive position against Norse expeditions. A founding legend relates that the son of a chief of the Mathesons acquired the power of communicating with the birds. As a result, and after many adventures overseas, he gained wealth, power and the respect of Alexander II, who asked him to build the castle to defend his realm.

Later the island became a stronghold of the Mackenzies of Kintail, originally vassals of Uilleam, Earl of Ross. The castle is said to have been garrisoned by Macraes and Maclennans at the time, both clans that were later closely associated with the Mackenzies. 

Traditional Mackenzie clan histories relate that Earl William sought advantage from the Treaty of Perth of 1266, by which King Magnus VI of Norway ceded the Hebrides to Scotland, demanding that his kinsman, Kenneth Mackenzie, return the castle to allow his expansion into the islands. When Mackenzie refused, Earl William led an assault against Eilean Donan that the Mackenzies and their allies repulsed.